Show hidden files in “Finder”

Open a terminal and run the following command:

defaults write com.apple.Finder AppleShowAllFiles TRUE

Remove all the running instances of the program:

killall Finder

Open a new finder. Now you should be able to see all hidden files.
Note.- If you want to rollback just run the following command:

defaults write com.apple.Finder AppleShowAllFiles FALSE

Show hidden files in “Terminal”

Just use the “ls” command with the -a (all) option.

ls -a